DEVELOPMENT OF MEANDER-LINE CURRENT STRUCTURE FOR SNS FAST 2.5-MEV BEAM CHOPPER

A new current structure for the fast traveling-wave 2.5MeV beam chopper for the Spallation Neutron Source (SNS) project has been developed [1]. The structure is based on the meander-folded notched stripline with dielectric supports and separators. Its design has been optimized using electromagnetic 3-D modeling with MAFIA to provide rise and fall times around 1 ns. A fulllength 50-cm prototype has been manufactured, and its measurements have been performed. Measurements results and their comparison with simulations are presented.